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LPS22DF Scheda tecnica(PDF) 10 Page - STMicroelectronics

Il numero della parte LPS22DF
Spiegazioni elettronici  Low-power and high-precision MEMS nano pressure sensor: 260-1260 hPa absolute digital output barometer
PDF  54 Pages
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Produttore elettronici  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LPS22DF Scheda tecnica(HTML) 10 Page - STMicroelectronics

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4.4
Interpreting pressure readings
The pressure data are stored in 3 registers: PRESS_OUT_H (2Ah), PRESS_OUT_L (29h), and PRESS_OUT_XL
(28h). The value is expressed as a 24-bit signed number (in 2’s complement).
To obtain the pressure in hPa, take the complete 24-bit word and then divide by the sensitivity 4096 LSB/
hPa. This same interpretation is applied to pressure readings when FIFO is enabled and the pressure
data are stored in 3 registers: FIFO_DATA_OUT_PRESS_XL (78h), FIFO_DATA_OUT_PRESS_L (79h), and
FIFO_DATA_OUT_PRESS_H (7Ah).
Figure 6. Pressure readings
(1)
PressureValue=PRESS_OUT_H2Aℎ &PRESS_OUT_L29ℎ &PRESS_OUT_XL 28ℎ =3FF58Dℎ=4191629LSB signeddecimal
(2)
Pressure ℎPA =Pressurevalue LSB
Sensitivity = 4191629LSB
4096LSB/ℎPA=1023.3ℎPA
LPS22DF
Interpreting pressure readings
DS13316 - Rev 1
page 10/54



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